Boring and milling machine



Jan.I 23, 1945. H. F. PHILLIPS v BORING AND MILLING MACHINE 'Filed May 16, 1942 15 Sheets-Sheet 1 Jan. 2 3, 1945. F @Humps 2,367,887

BORING AND MILLING MACHINE Filed May 16, 1942 15 sheets-sheet 2 INVENTOR.

Amr F. PH/LL/Ps.

ATTORNEY Jan. 23, 1945. H. F. PHILLIPS BORING AND MILLING MACHINE Filed May 16, 1942 15 Sheets-Sheet C5 H. F. PHlLLlPs BORING AD MILLING MACHINE l5 Sheets-Sheet 4 Filed May 16, 1942 f l r INVENTOR. BY HAR/w /L/DH/Lz. IPs. tdl,fVrroRNEY `Fam. 23, 1945. l

15 Sheets-Sheet 5 .Fdlllum H'. F. PHILLIPS BORING AND MILLING MACHINE Filed May 16, 1942 PH/L z. /P.s.

ATTDENEY @Shi/fry Jan. 23, 1945. H@ F. PHILLIPS y 2,367,887

BORING AND MILLING MACHINE Filed May 16, 1942 15 Sheets-Sheet 6 A INVENTOR. HAR/ r F. /DH/LL/PS,

ATTORNEY Ian. Z3, E945. H. F. PHILLIPS 2,367,887

BORING AND MILLING MACHINE 'led May 16, 1942 l5 Sheets-Sheet 7 INVENTOR. /vf my F PH/L n5.

v ATTORNEY l Jan. 23,1945.. H, PHlLLlPS 2,367,887

BORING-AND MILLING MACHINE Filed May 1e, 1942 15 sheets-sheet a A lNvENTOR HAR/2) F. PH/LL/Psv ATTQ/PNEY Jan. 23, 1 945. H. F. PHILLIPS 2,367,887

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Jan. 23, 1945. H. F, PHILLIPS BORING AND MILLING MACHINE Filed May 16, 1942 www www 1 1 bmw 'SMN Y 1 Jan. 23, 1945. H. F. PHILLIPS BORING AND MILLING MACHINE Filed May 16, 1942 l5 Sheets-Sheet ll ...l IIC.

l5 Sheets-Sheet l2 Jan. 23, l1945. H. AF. PHILLIPS BORING-AND MILLING MACHINE Filed May 1s, 1942 y f Jlv Jan. 23, 1945. H. F. PHILLIPS BORING AND MILLING MACHINE 15 sheets-sheet 13 Filed May 16, 1942 INVENTOR. /QR/w fPHlLL/Ps.

BY a E 7 ATTORNEY H. F. PHILLIPS BORING AND MII'ILING MACHINE Jan. 2 3, 1945.

Filed May .16. 1942 15 Sheets-Sheet IIAv @NIT HUM? F, /DH/L/Ps/ ATTORNEY Jan. 23, 1945.

H. F. PHILLIPSv 2,367,887

BORING AND MILLING MACHINE Filed .May 1'6, 1942 l15 Sheets-Sheet l5 iIIIIUI/ am iA i 51z-\ s@ n J x 3H 320 71# ,4 5,5 A g 1 s1@ C ,bz-U

j 2W i "ggglNvENToR N| BY f/Anr F, PH/-LL/ES.

' K Aaamrrofe/VEV Patented dan. 23, 1945 ascassr Bonnie AND MILLING MACHINE Harry F. Phillips, Sprin giield, Mass., assignor to Baush Machine Tool Company, Springfield, Mass., a corporation of Massachusetts Application May 16, 1942, Serial No. 443,204

18 Claims.

My invention relates to a boring machine and more particularly to a horizontal machine which can be used for drilling, milling, prole milling, boring, slotting and similar purposes.

l'n the operations of boring, milling, etc.,..1't is necessary to be able to vary the speed of rotation and feed of the tool in order to adapt it to the particular conditions of any given work as, for example, to avoid such a rapid feed as would overheat the cutting tool. This speed will be determined by the hardness or toughness of the metal, sometimes by the precision required as, for example, rough or nish cuts, or by other factors.

Also it is desirable to be able. to vary independently the speed of rotation of the cutting tool and the movement of the workpiece relative thereto in horizontal and vertical directions.

In my present invention I provide a machine of the above type in which the speed of rotation of the cutting bar or tool may be varied continuously or by innite range as, for example, eight revolutions per minute to eight hundred revolutions per minute and independently thereof to move the work-supporting table and work horizontally or vertically, also with an infinite gradation, or continuously variable between wide limits as, for example, between one-half and nine inches per minute and with a rapid traversel as, for example, about fifty inches per minute.

To provide a rotation of the tool-carrying bar at a speed of rotation that may be varied progressively throughout the entire range, this bar is driven by an electric drive comprising a motorgenerator set which takes in alternating current and supplies a direct current'to a direct current driving motor in such manner that the voltage of the direct current supplied by the motor-generator lset may be varied to give a range of with constant torque and increasing power up to a certain limit and beyond this limit to obtain a further increase of speed at constant power and decreasing torque by control of the direct current eld. This is accomplished by providing a sepa-` rate eld current to supply the eld of both the generator of the motor-generator set and the ield of the direct current motor.

' Each of these eld circuits is controlled by a rheostat. The field of the generator may be lncreased thereby increasing the voltage of the generator output. As this voltage'is increased the speed of the direct current motor is increased with constant torque and correspondingly increasing power.

When the upper limit of speed range is reached gradationsover a very wide by this method the current through the field of the motor is decreased which results in further increasing the speed of the motor with constant power but reduced torque. This type of control is of the general type known as the Ward Leonard.

The feed of the boring bar, or movement of the table or support for the workpiece, is controlled by a fluid driven pump. Preferably this uid system comprises two fluid driven motors, one of which controls the longitudinal movement of the table, that is, longitudinally of the cutting or toolsupport bar or, alternatively,the vertical movement of the cross-head, while the second, independently controls the cross feed of the table or, alternatively, the boring bar feed.

The speed of each of these motors may be hydraulically controlled continuously or progressivelyorwith infinite gradations, so that the relative positions of cutting tool as, for example, a rotating milling cutter and the workpiece, may be continuously varied horizontally and vertically and thus may be guided by the operator through any desired course, Whether regular or irregular as, for example, throughout a circular path, elliptical, or of irregularly varying outline.

speed Similarly, rotation of the cutting bar may be stopped and held xed while the work-holding table may be moved horizontally in either direction relative thereto, or the cutting bar may be moved longitudinally relative to the table, thereby enabling slotting or keyways to be cut.

For drilling or boring the workpiece the table may be adjusted to any required position relative to the cutting bar and then held while being drilled orbored. Thus a number of vdifferent operations may be carried on on a single workpiece without resetting on the table.

The various features of my invention are illustrated, by way of example, in the accompanying drawings in which- Fig. l is a front elevation of a machine embodying a preferred form of my invention;

Fig. 2 is a plan view of the machine shown in A Hg. "am

Fig. 3 is a`n end of Fig. 1;

F'g. 4 is an end elevation taken from the left of Fig. 1;

Fig. 5 is a vertical section through a head stock of the machine taken on line 5 5 of Fig. 3:

Fig.y 6 is a transverse section through the head stock taken on the line 6 6 of Fig. 5;

Fig. 7 is a vertical cross-sectional view of the head stock taken'on line 1 1 of Fig. 1:

Aelevation taken lfrom the right Fig. 22 is a section through the table and sup.

porting saddle of the machine taken on line 22--22 of Figs. 1 and 2:

Fig. 23 is a section on the line 23-23 of Fig. 2;

Figs. 24 and 25 are respectively sections on the line 24-24 and 25-25 of Fig. 2;

Fig. 26 is a plan view of the tail stock and part of the base on which it is mounted;

Fig. 27 is a vertical section on the line 21-21 of Fig. 2'6;

Fig. 28 is a vertical section of the tail stock and base taken on line 28-28 of Fig. 26;

Fig. 29 is a vertical detail section line 29-29 of Fig. 26. I

Fig. 30 is an axial section through a hydraulic pump and its control valves.

Fig. 31Yis a part section taken on the line 3 |-3| of Fig. l5.

In the embodiment of my invention shown in the accompanying drawings, a head stock 3| is mounted to slide vertically on an upright column 32 extending upwardly from the rear part of a base 33 near one end thereof.

The part of the base 33 immediately below the vertically movable head stock 3| contains a gear box through which power under controlled speeds is transmitted to the head stock and also to an extension of the base 33 on which there is taken on the mounted 9. saddle 34 slidable longitudinally on guides on the extension of the base, and a table 35 slidable on the saddle transversely `or crosswise of thedirection of movement of the saddle.

A tail stock 38 may be mounted von the base near the end opposite the head stock 3| and column 32. The Mcolumn 32 is provided with guide plates 31 and 38, Fig. 1, against which are guided sliding surfaces on the head stock 3|.

Supported on the upper end of the column 32 and on a vertical shaft 39 spaced forwardly of the column 32, is a bridge 40 from which the head stock 3| is supported. The head stock 3| is counterbalanced by a weight 4| in the column 32 connected to the .head stock by means of a, chain 42 passing over pulleys 43 and 44 in the'bridge 40.

The head stock 3| carries acutting bar together with gearing for driving or rotating the cutting bar and is in turn driven from the gear box of the base through a splined shaft on which the head stock 3| slides freely vertically.

Variablecutter bar drive The cutting bar is driven by a variable speed motor 45 of the Ward Leonard type of alternating current motor generator direct current motor system described above. For this purpose the shaft 48 of themotor, Figs. 1 and 20, extends a short distance into the gear box, or the base 33, and is coupled by a coupling 41 to a drive shaft 48 rotatably'mounted 'in bearings and 50 in the gear box.

Between the bearings 48 and 58 is a worm 5| which meshes with a worm gear 52, Fig. 10, keyed or otherwise secured on the lower end of a vertical splined shaft 53 journalledat its lower end in a spider 54 secured to lugs in the base, and extending upwardly through the vertically slidable head stock 3| to the bridge 4|) in which it is journalled at its upper end, Figs. 1, 3, 5 and 7.

Slidably splined on the shaft 53, as shown in detail in Fig. 7, is a worm gear 55 rotatably supported in upper and lower bearings 58 and 51 secured to the rear face of the head stock 3| The splined connection thus enables the worm gear 55 to ride up and down with the head stock 3| and to be rotated by the rotation of the splined shaft 53. The Worm gear 55 inl turn meshes with a gear 58 which in turn is keyed onto a quill 59 slidably splined on a shaft 60, Fig. 5.

The quill 59 is in turn rotatably mounted between a pair of bearings 8l supported in the left or front end of the head stock, and a pair of bearings 62 mounted in a bracket at the opposite end of the quill. As the motor 45 rotates, it, therefore, transmits its motion proportionately at a reduced speed through the shaft 48 and gears 5|, 52, splined shaft 53, worm gear 55, slidably splined thereon, and gear 58 meshing therewith to the quill 59. Within the quill 59 the shaft 80 is slidable and at its front end has a gear 83 which in the rearmost position meshes with a large wheel 64 keyed onto a cutting bar quill 85 rotatably mounted at its front end in bearings 88 in the front wall of the head stock 3 Fig. 5.

'Ihe opposite end of the quill 85 is supported in bearings 81 mounted in the opposite end of the head stock 3|. Through the above gearing, therefore, the quill G5 is driven from the shaft through the pinion or small gear 53, and the large gear 84 to give the quill 65 a relatively reduced speed in a forward direction. It will be understood, of course, that the speed thus irnparted to the quill varies with the variation in the speed of the motor 45.

Slidably keyed within the quill 85 is a boring bar 68 the front end of which has a tapered recess 69 to receive a cutting tool. Also secured to the front end of the hub of the gear 84 is a face plate 10 which may be provided with suitable radial T-grooves, not shown, to which milling or other cutters may be secured to mill or finish the face of a workpiece brought against said face plate.

The space between the edge of the face plate 10 and the driving end of the head stock is enclosed by a cover 1| through which the face plate 10 projects.,

The gears 83 and 84 may be moved out of engagement or mesh by sliding the shaft 80 forwardly until the gears are out of mesh and then may be engaged through a second set of gears to drive the cutting bar quill 85 at a higher rate of speed for a given speed of the motor 45. To disengage the gears 83 and 84 the shaft Il is slid forwardly in the quill 59 by means of a `fork 12 rotatably engaging an annular groove 13 on the rear end of the shaft 88 and slidably supported on a sliding shaft 14 to aprojecting end of which ythe fork 12 is bolted. The shaft -14 is slidably supported in brackets in the upper wall of the head stock.

The front end of the shaft 14 has an axial recess 15 into which projects a sliding shaft 18. The lower end or surface of the hollowed shaft 14 is slotted and the lower surfaces of both the shafts 14 and 18 are formed with rack teeth throughout this slotted 5 vand 8.

The rack teeth of the shafts 'i4 and 'i6 arein turn engaged by the teeth of a pair of mutilated gears ll and '18, or of a central mutilated gear 7S keyed onto a cross-shaft 80 which extends through and is journalled at 8| in the front face of the head stock. i

A crank arm or handle 82 is pinned onto the front end of the shaft 80. The crank handle 82 is provided with a pin 83 which is received in a recess in the face of the head stock but which may be withdrawn by tilting-the crank 82 on a transverse axis against the reaction of a spring dit. When the pin 83 is thus drawn the shaft 88 may be rotated a full rotation in either directionv portion, as shown in Figs.

. When rotated counter-clockwise from the posi-- in Fig. 5 the teeth of the mutilated tion shown gears ll and 78 first engage the rack teeth of the hollow shaft 'Mi and move it to the left, carrying with it the fork i2 and shaft til and moving pinion @3 out of engagement or mesh with the large gear Sd. Further movement or rotation of the shaft @e causes the teeth of the intermediate mutilated pinion or gear lil to engage the rack teeth of the, inner shaft lli and move it to the left.

Mounted on the left end, Fig. 5, of the shaft it is a fork t5, the forked ends of which encircle and As the shaft 'it is moved to the left, Fig. 5, the clutch member ed is moved into engagement with a clutch face el' on a gear 88 rotatably mounted on bearings @d on the quill 59 and thus imparts the power from the quill 59 to the gear 88, while the shifting of the gear 63 has disconnected this quill from the gear 6d.

The gear 88 in turn meshes with a smaller gear @t keyed onto the cutting bar quill 65 and. therefore, drives the latter. This serves to drive the quill at a much more rapid speed than would be the case through the gears S3 and 66 for a given speed of the motor d5.

To return the drive to a slower speed, it is merely necessary to pull the crank arm 82 outwardly, disconnect the pin 83, turn the crank shaft and arm 80 in the opposite direction, whereupon the teeth of the gear 'I9 will ilrst engage the rack teeth of the shaft 18 and move the shaft 16 to the right disengaging the clutch 88 and thereafter the teeth of the gears 11 and 18 will engage the rack teeth of the hollow shaft 74 and move it together with the fork 12 and shaft 80 to the right causing the gear or pinion (Si to again move into mesh with the large gear 6 rotatably engage a clutch member 86.

field current in the lower speed range as,

. eighty revolutions per minute; then decreases the .current in the field of the motor 45 to give a higher. speed withdecreasing torque, as from eighty to eight hundred revolutions per minute. In this way a wide range, from eight to eight hundred or any similar range, may be obtained.l

Inasmuch as the wiring connections, rheostat, etc., for the motor-generatorset and the ileld of the motor 45 are known and may be of any standard or suitable construction they are not illustrated in the drawings.

The speed of the quill59 may be transmitted to a suitable tachometer 90, Fig. 1, by means of a pinion Si, Fig. 7, meshing with a gear 92, Figs 5 and 7, and engaging with an attachment through a Bowden wire or other suitable connection. The pinion 9| may be supported in a suitable bracket in the casing of the stock head.

The starting switch 98 of the motor 45, and stopping switch 94, are provided in the 'upper front part of the ybase -33 immediately over the gear case. The speed of the motor is controlled from a crank handle 95 whiclliE is connected to a drum rheostat. rotatable to control successively the ield current to the generator of the motorgenerator set, which y be conveniently located in the base of the column 32, andthe field curl rent to the motor 45.

For example, as the'handle 85 is moved progressiveiy in one direction it first increases the Variable hydraulic drive head stock are obtained by means of a hydraulic pump and a motor driven therefrom together with suitable control valves.

For flexibility of control there are two sets of pumps and hydraulic motors, one of which drives alternatively the'longitudinal table feed or the vertical feed of the cross head or head stock., and the other alternatively the cross feed .of the table or the boring. bar feed. These two have independent circuits and may be independently controlled or driven by a single motor.

The control of the feed is obtained by controlling the delivery of the pump and the direction of rotation of the hydraulic motor is controlled by a, reversing valve. A

The pump is capable ofdelivering either a large quantity of fluid at a relatively low pressure for rapid traverse, o-r a smaller variable amount of uid under a, higher pressure of feed.

The delivery of the high lpressure feed is obtained by means of a variable displacement pump supplied with fluid from a constant displacement pump. The variable displacement pump is preferably one having a number of pistons as, for example, five which are displaced by fluid entering through an inlet port and valve under pressure against la wobble support, that is, a plate supported on a universal fulcrum at its center and having a stem extending at right angles from the center of the plate and the freee end of which may be rotated in a circular path to cause the peripheral part of the plate alternately to push the pump cylinder outward and let it return, thereby giving it a reciprocating action.

The stroke of the pumps may be shortened or lengthened by shifting the wobble plate longitudinally of the pumps. Thus, with a. constant speed motor drive for the end of the' pump the delivery is controlled by advancing or retractlng the support of the wobble plate. However, unless fluid is supplied under pressure the pistons will not be held against the wobble plate and, for this purpose, a high delivery constant displacement pump is employed, which delivers to the variable displacement pump, the excess fluid .passing Athrough a pressure release valve back to a central above the pressure limit set, the fluid will, however, be delivered at the higher pressure only at a rate determined by the variable displacement Dump.

The liquid delivered by the hydraulic pump passes to a hydraulic motor of similar construction to that of the variable displacement pump namely, one having a number of pistons acting against the tilting plate to give a rotary motion to a. stem extending therefrom.

The speed at which this motor is driven is in each case governed by the amount of fluid delivered to it and thus the speed of the driving motor may be very closely controlled by gradual and progressive displacement of the support able transmission mechanism drives a pair of hydraulic pumps, one for each of the two feed systems.

A suitable variable delivery pump is illustrated in Fig. 30. This pump has a housing made up of a succession of parts, one of which H2, contains a constant displacement rotary pump ||3 keyed onto a shaft .I |4 on which alsoyis keyed a pulley ||5 driven by the belt I.

Immediately adjacent the housing ||2 is a port housing H6 containing a number of valves or ports, and a third housing ||1 containing a variable displacement pump. The v-ariable displacement pump comprises a number of cylinder bores symmetrically and uniformly disposed about the axis of the pump and containing sliding pistons H8, the outer ends of which may bear against the side surface of a wobble plate IIS supported at its center on a wobble support plunger 20 so as to tilt freely in al1 directions on a spherical boss |2| thereon. A wobble m0- tion is given to the plate" ||9 by an integral projecting stem |22 extending from the side opposite the plunger |20 and engaging in an inclined eccentric socket |23 in the adjacent end of the shaft ||4 and extending radially therefrom.

'I'he plunger |20 may be moved toward or from the end of the shaft ||4 by means of one or more cylindrical cams |24 which engage the surface of the supporting plunger |20, and which i may be rotated by screws |25 and |26.

r It will be apparent that as the supporting plunger |20 is moved toward the shaft ||4, the wobble plate will tend to straighten the end of the stern |22 moving nearer the axis of the shaft ||4 and consequently the stroke of the pistons ||8 will decrease.

Liquid is drawn through an intake, notshown in Fig. 30, into the constant displacement pump ||3 and thence delivered to the inlet ports of the pistons H8. A by-pass comprising a charging valve and a neutral valve, each of which may fluid to escape, the remainder serving to hold the plungers or sliding pistons ||8 against the plate 9 entirely closing the pressure release valve. All of the fluid will be delivered by the pump ||3 through the inlet and outlet ports of the variable displacement pump for rapid traverse.

Another valve permits return to the supply tank at a pressure insumcient to supply the' be closed hydraulically, permits a part of the y variable displacement pump and when this valve is opened all they fluid returns directly to the supply tank without passing to the hydraulic motor. 'I'his position is a neutral position in which the hydraulic motor is not driven.

In Fig. 21 there are shown two hydraulic motors |28 and |23 for which there are two control valves |30 and |3I. Each of the motors and control valvesis connected to a separate pump, the connections being indicated for the motor |28, it being understood that the same connections will apply to motor |20 and its control valve |3|, but are omitted for the sake of simplicity.

The control valves |30 and |3| have shafts |32 and |33, the ends of which are provided with a segment of a gear |34 and |35 respectively. The shafts |32 and |33 of the valves |30 and |3| may rotate in either direction from a neutral position and each direction of rotation places the valve first into a position corresponding to controlled feed and then upon further movement into rapid traverse either in forward or reverse direction.

Referring to Fig.' 21, when the shaft of the valve |30 or |3| is inneutra1 position, fluid is transmitted from a pressure supply source, not shown, through a pipe |33 to a neutral valve in the pump housing. 'I'he pump y| I3 continuously draws fluid from a supply tank |31 through an intake line |33 and pumps it through the neutrai valve directly back to the tank |31 through a return pipe |39. l

When the valve shaft is turned toward a reversing position, it supplies fluid through a reversing pipe line |40 to shift the reversing valve and thence through a charging line |4| to cause the fluid delivered by the pump ||3 to pass to the variable fluid pump pistons ||8 from whence it is delivered through one or the other of a pair of delivery and return lines |42 and |43 to the respective hydraulic motor |28 or |29, the fluid returning through the other of the two lines. This causes the hydraulic motor to be driven at a speed corresponding to the position of the wobble plate H9.

When the valve |30 or |3| is rotated in the opposite direction it releases liquid from the reversing pipe |40 permitting the reversing valve to return to its original or forward position and at the same time supplies liquid through the charging line |44 to reverse the delivery of the pump and cause the fluid to be delivered to and to drive the motor in the opposite direction.

When the valve is turned to its furthermost position it stops Vthe overflow from the pump ||3 so that all of the liquid from this pump must then pass through the valves of the wobble pump regardless of the delivery of the latter and supplies a maximum of liquid at a lower pressure to drive the motor |23 either in forward or reverse position.

Fluid for closing the overflowvalve from the pump ||3 is supplied through a line |45. Excess nuid returns to the vsupply tank |31 through a pipe |48. Thusl by turning the shafts of the valves |30 and |3| to any one of five different positions the pump ||3|21 will either fail to deliver any uid to its respective motor |23 or |29 or deliver a controlledvvariable supply in either forward or reverse direction, or will deliver a maximum of fluid at a lower pressure in either direction to drivethe motors for rapid traverse. I

The motors |23 and |23 are similar to the pump H1, having a wobble plate |41, Fig. 15, which is, however, supported on a iflxed pivotal support |48 and is operated by a series of pistons or plungers |49 driven by iiuid admitted and exhausted through the pipes |42 and |43. The tilting of the wobble plate |41 progressively serves to rotate a drive shaft |50 to drive the respective mechanisms.

The shafts |32 and |33 of the control valves |30 and 3| are rotated or controlled respectively by a pinion mounted on a shaft |52 and a pinion 53 mounted on a quill |54 surrounding the shaft 52, Figs. 1l, 12 and 21.

The shaft |52 and quill |54 extend horizontally through the gear casing of the base 33, being rotatably supported in bearings |55 and |56, Fig. l2.` Keyed onto the quill is a pinion |51 which meshes through an intermediate or idler pinion |58 with a slidable rack bar |59. Similarly`a pinion |60 keyed on the shaft |52 meshes with an idler |6| which in turn meshes with a slidable rack bar |62, Fig. 17. By sliding the bars |59 and |62 respectively, the pinions |53 and 5| are rotated to control the valves |30 and |3|.

The rack bars |59 and |62 are independently slidable and are actuated by cranks or levers |63 and |64, Figs. l, 1l, 12 and 15 respectively, carried on rotatable hubs |65 and |66 in an upwardly inclined panel |61 of the base 33. Each of the hubs |65 and |66 carries a respective quill |68 mounted on pinions |69 and |10, Figs. -12, and 1'7, which in turn mesh with racks |1| and |12 on the rack bars |59 and |62 respectively. Consequently, when the crank handle |64 is rotated it shifts the rack bar |62, rotating the pinions |6| and |60 and the shaft |52, and pinion |5| to actuate the valve |3. Similarly when the handle |65 is rotated it shifts the rack bar |59, rotatingthe pinions |51 and |58, quill |54 and pinion |53 to actuate the control valve |30.

The levers or cranks |64 and |65 are in mid position for neutral from which they may be turned in either direction to set positions for either forward or reversing variable feed. When swung still further they turn the control valves for rapid traverse in either forward or reverse position corresponding to direction of movement of the lever.

To control the feed, when the levers |64 and |65 are in feeding position, a shaft |13 is proand |29 independently through the levers |63 and |64 and the knobs |14 and |15.

Cutter bar feed mechanism 'The cutter bar feed mechanism is driven from the variable speed motor |29 through a gearing in the base 33 to a vertical splined shaft extending upwardly to the head stock or cross bar 3|. This gearing comprises a shaft |83, Fig. 14, journalled in bearings |84 and |85 and projecting about and keyed to the drive shaft of the motor |29. The shaft |83 carries a pinion |86 which meshes with a pinion |81 of a shaft |88 jourupwardly through the head stock 3|.

vided centrally of the quills of each of the control mechanisms. A knob |14 or |15 is provided on the outer end of the respective shafts to permit them to be turned by hand independently of the hub |66 and on the-respective shaft near its inner end there is mounted a bevel pinion |16 or |11 respectively from which control may be transmitted by any suitable means as, for example, by meshing bevel gears |18 and |19 in any suitable flexible transmission, such as a Bowden wire or cable |80 or |8|, Fig. 31, which extends to the screws |25 or |26, Fig. 30.

It will be understood, of course, that this flexible connection may be carried to any convenient position other than that shown so that the speed of the various feeds might be controlled from any part of the apparatus. y

A stop and start switch |82 for the motor ||0 may be provided in the frontpart of the Apanel |61. The motor having been started by the switch |82, the operator may then control the direction and speed of the hydraulic motors |28 Slidably mounted on the shaft |96 and keyed thereto within the head stock 3| is a worm |98, Fig. 7, which, therefore, moves upwardly with the head stock 3| but is rotatable with the shaft |96. The worm |98 in turn meshes with a worm gear |99, Figs. 6 and 9, rotatably mounted on a quill or hollow shaft 200 with which it`may be clutched and from which the bar feed mechanism may be driven. The hub of the gear wheel |99 and the quill 200 are journalled respectively in bearings 20| and 202 in a bracket 203 of the head stock at one side of the gear and in bearings 204 and 205 respectively in a bracket 206 secured to the bracket 203. This permits the gear |99 and the quill 200 to rotate freely when unclutched from each other.

The gear 'wheel |99 and quill 200 may be caused to rotate together by means of a sliding` clutch ring 201 on the quill 200 secured by means of pins 208 extending through slots 209 in the quill 200 into slots in a slidable rod 2|0, Fig. 6.

When the rod 2| 0 is drawn toward the left the clutch ring 201 is brought into engagement with clutch teeth 2| on the inner part of the hub of the gear 99 and the gear |99 drives the quill 200.

Keyed to the end of the quill 200, projecting through the bracket 206. is a beveled gear 2|2 which meshes with a beveled gear 2|3 on a screw shaft 2|4 extending rearwardly of the head stock 3| into an extension 2|5 thereof. The screw shaft 2| 4 is rotatably mounted at its forward end in bearings 2 I6, and at its rear end in bearing/Vs 2|1, Fig. 5, to be driven in either direction by the quill 200, gear |99 and gears 2|2 and 2|3. The yshaft 2|4 is threaded as at 2|8 within extension 2|5. A nut 2|9 is threaded onto the shaft 2|8 and is in turn secured to a clamp 220 that engages the cutting bar, or tool holding bar 68. This clamp may be tightened by means of a screw and handle 22| The clutch ring 201 maybe disengaged from the teeth 2|| by sliding the rod 2|0 to theright of Fig. 6. and the quill 200 may then be rotated of gears or pinions r 

